#include <ctime>
#include <iostream>
using namespace std;
int p[500] = {1, 2, 4, 6, 12, 24, 36, 48, 60, 120, 180,
              240, 360, 720, 840, 1260, 1680, 2520, 5040, 7560, 10080,
              15120, 20160, 25200, 27720, 45360, 50400, 55440, 83160,
              110880, 166320, 221760, 277200, 332640, 498960, 554400,
              665280, 720720, 1081080, 1441440, 2162160, 2882880, 3603600,
              4324320, 6486480, 7207200, 8648640, 10810800, 14414400, 17297280,
              21621600, 32432400, 36756720, 43243200, 61261200, 73513440,
              110270160, 122522400, 147026880, 183783600, 245044800, 294053760,
              367567200, 551350800, 698377680, 735134400, 1102701600, 1396755360, 2001000000};
int main()
{
    int n, pos = 0;
    cin >> n;
    while (++pos)
    {
        if (p[pos] > n)
        {
            pos--;
            break;
        }
    }
    cout << p[pos] << endl;
    return 0;
}